Air purifier



FIG. 1 is a perspective view of an air purifier, showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is another side view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof;

FIG. 8 is an enlarged view of the encircled portion 8 of FIG. 1; and,

FIG. 9 is an enlarged view of the encircled portion 9 of FIG. 2.

The broken lines in the figures illustrating portions of the air purifier are for environmental purposes only and form no part of the claimed design.

The dot-dash broken lines encircling enlargement portions of the design form no part of the claimed design. 

CLAIM The ornamental design for an air purifier, as shown and described. 